FOR FIREFOX BROWSER:
Open the Firefox browser and in the address bar type: about:config Press Enter
You would probably get a certificate stating: This might void your warranty! You can ignore that message this time and click on the button: I'll be careful, I promise!
The following page would open up:
In the filter box, below the address bar, type: network.http.sendRefererHeader and press enter. The details of the preference name network.http.sendRefererHeader would open and the remaining entries vanish, which makes it easy to work through.
Double-click on that entry and change the default value which is given as 2, to 0 (zero).
Now u can view the images posted on Imageshack with your firefox browser.
FOR OPERA BROWSER: Its a single step. Open the Opera Browser, press F12 and disable "Send Referrer Information"
And your Opera browser is also ready to view images from Imageshack.